384042809 has 2 divisors, whose sum is σ = 384042810. Its totient is φ = 384042808.

The previous prime is 384042751. The next prime is 384042821. The reversal of 384042809 is 908240483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384042409 + 400 = 19597^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 384042809 - 2¹⁶ = 383977273 is a prime.

It is a super-2 number, since 2×384042809² = 294977758289220962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (384032809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192021404 + 192021405.

It is an arithmetic number, because the mean of its divisors is an integer number (192021405).

Almost surely, 2^384042809 is an apocalyptic number.

It is an amenable number.

384042809 is a deficient number, since it is larger than the sum of its proper divisors (1).

384042809 is an equidigital number, since it uses as much as digits as its factorization.

384042809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 384042809 is about 19597.0102056411. The cubic root of 384042809 is about 726.8752462387.

The spelling of 384042809 in words is "three hundred eighty-four million, forty-two thousand, eight hundred nine".